After consulting with the bank, I cannot adjust the repayment rate for loan 1. So it will continue until 2031 and then be paid off, possibly with special repayments. However, for loan 3, an increase in the repayment rate is possible. Currently, the repayment rate is 2% and I can adjust it up to 5%. I need to calculate everything now, but I will make an increase then. I could not find anything about adjusting the repayment rate in any of my bank documents.